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Spring question

svtmikey

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When "they" talk about coil springs, as in "2 1/4" or "2 1/2", what does this refer to?
Is it inside diameter, or outside diameter, or is it something else?

Thanks
 
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svtmikey

svtmikey

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Thanks for the info!

Do you know what a 69 Triumph GT6 would have?
 
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